You can open and use one QB database with both Pro and Premier at the very same time. SAME basic product and database, just some extra reporting in Premier. I have done this. There is no need for Pro and Premier on the same computer and it is not supported.
I hope this helps you client.

You cannot install both Pro and Premier on the same computer. That is your issue. It is not supported.

Pick one or the other and uninstall what you don't want.

If after uninstall Premier (say) and Pro says it needs to be upgraded, then uninstall ALL QuickBooks and restart the computer. Now install (say) just Pro and it will work correctly.

Once you have one version of QuickBooks properly installed and updated, it will work with the database. Of course, ALL computers need to be at the same "R" update level. They can be either Premier or Pro, but all versions must be at the same "R" level. That is because, some QB updates cause database updates.

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